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    <meta charset="UTF-8">
    <title>Document</title>
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<script>
    //1.参数问题
    //1.1.放入两个参数
    const sum = (num1, num2) => {
        return num1 + num2
    }

    //1.2.放入一个参数
    const power = num => {
        return num * num
    }

    //2.函数中
    //2.1函数代码块中有多行代码时
    const test = () => {
        //1.打印Hello World
        console.log('Hello World')

        //2.打印Hello Vuejs
        console.log('Hello Vuejs')
    }

    //2.2.函数代码块中只有一行代码
    // const mul = (num1, num2) => {
    //     return num1 + num2
    // }
    const mul = (num1, num2) => num1 * num2
    console.log(mul(20, 30))

    // const demo = () => {
    //     console.log('Hello Demo')
    // }
    const demo = () => console.log('Hello Demo')
    console.log(demo())


</script>
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